Dynamo-electric machine



(NC Model.)

G. W. FULLER.

DYNAMC ELECTRIC MACHINE.

Patented OCt. 9, 1883.

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e UNITED STATES PATENT OFFICE.

GEORGE IV. FULLER, OF NORVICH, CONNECTICUT.

DYNAMo-ELECTRIC MACHINE.

SPECIFICATION forming part of Letters Patent No. 286,416, dated October 9, 1885;.

Application filed August'QQ, 1883. (No model.)

To all whom it may con/@WM5 Be it known that I, GEORGE W. FULLER., of Norwich, Connecticut, have invented certain Improvements in the Construction of Spiral Cores for Dynamo-Electric Machines, of

which the following is a specification.

' spiral core constructed according to my invention, are as follows, viz:

Figure l is a central longitudinal section exhibiting several eonvolutions of the spiral in elevation. Fig. 2 is an end elevation. Fig. 3 is an isometrical perspective of one of the sectors of which the spiral is built up. Fig. 4 is an elevation showing the'inethod of unit ing the adjoining convolutions of the spiral by offset lapped joints.

The drawings represent a spiral ribbon of iron. composed of sectors successively united together by the lapping and fastening of their adjoining radial edges. The width of the sectors-or in other words, their dimensions in degrees ofthe circle-may be varied according to the diameter of the core, and also according to the thickness of the iron plate et which they are composed, so that the sectors will be sufficiently light to be easily handled in put` Ating them together. In the drawings each sector is represented as having an arc of one hundred and twenty degrees, plus the amount required for the overlapping joints.

The sectors a may be made of either cast or wrought iron, and, when thin enough to admit of the springing apart of the convolutions of the spiral into which they are embodied, may be united by the scar-fed joints b, secured by the rivets or screws c. W'hen thus constructed, y

the convolutions of the spiral may be sprung apart suiiiciently to permit aweb of paper, d, or some other insulating material, to be interposed betweenthem, and may then be clamped together by the nuts e c, applied to the armature-shaft A, and bearing, respectively, upon the outer convolutions at the opposite ends of the spiral. In the larger convolutions it will be undesirable to make the shaft of the full diameter of the interior of the convolutions,

/ as may be done in armatures of smaller diameter. I therefore construct t-he shaft with longitudinal radial wings f, which project from the body of the shaft sufficiently to form a bearing for the convolutions ofthe armature. Between these wings and the armature an insulating material, g, isintroduced. Vhen madeof thicker plate, too rigid to permit of the spring ing apart of the convolutions of thespiral, 4or if for any reason it be desired, every third joint may have the offset i,- or if the sectors are of less width than when a sufficient number of sectors have been united to form a circle, the oifset jointi may be employed to unite one circle of sectors to the next circle of scc tors, and so on.

It will be of course understood that the several sectors may be either cast or otherwise i'ormed with the proper wind to enable them, when joined, to form the desired spiral without being sprung, but it will ordinarily be the case that the plate of which they are composed will be thin enough to have the neeessary flexibility, so that the sectors may be made of iiat plate. In either ease it will be seen that a spiral armature core of large size may be built up of sectors which are easily and conveniently handled.

rIhe spiral core, when mounted upon the shaft A, may be wound in the ordinary ways by the wire composing the induction-coil.

I claim as my invention- A spiral core for the armature or" a dynamoelectric machine built up `of sectors of iron plate successively united by having their adjoining radial edges lapped and riveted, screwed, or otherwise fastened together, substantially as'set forth.

GEO. IV. FULLER.

Vitnesses:

Jenn E. EAELE, Jos. C. EARLE. 

